Car-brake



2 Sheets-Sheet l.

(No Model.)

JAMES J. 85 JOHN HARKINS. CAR BRAKE.

Patented Mar. 9, 1886.

(NdModel.)

`2 sngets-sheeu2-f JAMES J.' 81; JOHN HARKINS. GA-R'BRAKE.

Patented Mang, 1886.

UNiTnD STATES JAMES J. HARKINS AND JOHN HARKINS, OF PITTSBURG,PENNSYLVANIA. l

PATENT OFFICE.

t CAR-BRAKE.

SPECIFICATION forming part of Letters Application filed September 2,1884.

T 0 all whom it may concern:

Be it known that we, JAMES J. HARKINs and JOHN HARKINs,both citizensofthe United States,and residents of Pittsburg,in the county ofAllegheny and State of Pennsylvania,have invented a new and usefulImprovement in Car-Brakes, of which the following is aspecication.

Our invention relates to means by which the movement of the axle andwheel is utilized to apply the brakes.

Our invention consists in the construction hereinafter described, andpointed-out in the claims. v

In order that our invention may befully understood, we will proceed todescribe it with reference to the accompanying drawings, in which-Figure 1 is a side elevation of the parts within and without the casing,the parts without being removed anda portion of the casing beingomitted. Fig. 2 is a section on line with the axle. Fig. 3 is an innerend view, a portion ,of the casing being omitted. Fig. 4 is afaceviewv-of the disk and spider, the line of travel of the latter toeccentric position being indicated by an arrow through the center, thecircular arrow indicating the lateral resistance of the vibrator. Fig. 5is a face view of the slide and guide,thelatter being removed. Fig. 6 isa face view ofthe spider.

W is anar-wheel, and Ha car-axle adapted to receive our improvement.

A is a disk divided for ready application to the wheel around the axleand securelyA bolted together and to the wheel. The disk is formed witha recess to iit the hub of the wheel,a concave face to receive a spider,and radial re cesses a', forming projections or lugs a.

B is a spider formed with convex inner side to fit the concavity of thedisk, and having T- shaped arms or lugs b working between theprojections or lugs a in the recesses a of the disk. The outer side ofthe spider is dat. Also, surrounding the axle is a sleeve, C, having aconical head, G, at the disk end, and atV the outer end longitudinalslots C and flanged collar C.

F is a collar surrounding the slotted end of the sleeve and secured tothe axle through the Patent No. 337,579, dated March 9.1886.

serial No. 141081. (No model.)

spiral spring, S', for pressing the head of the sleeve into the centralopening of the spider,

and thus retain the latter in normal position.

The forward end of the block is inclined, as

shown,- and when it is brought to bear on the spider it shifts thelatter to the eccentric sition show n in Figs. `2 and 4.

' D2 and D4 are straight grooves and Ds and D5 inclined-grooves for thepin K of a lever,

J.. The inclined grooves, like the straight` grooves,meet at their outerends and intersect the outer ends of the latter. grooves, and also thestraight grooves, meet at The inclined their inner ends. On the out erend ofthe block is formed a circular depression, forming an annularprojection beveled on the inside, to provide a bearing, D7. Anoutwardly-inclined radial opening is made in the projection to provide abearing, D6.

g g are two parts of a guide loosely mounted on the sleeve between thefixed collar F and the sliding block DD. The parts are secured togetherby plates g2 g3, .forming anges, on which is guided a slide, E, formed.with projections E E2 E3 and E5 E5. The projections E2 and E3 bear onthe annular projection of thev block, the projection E bears on thecollar F, and the projections E5 E5 on opposite sides of the flange ofcollar C. I is the casing surrounding the interna mechanism, formed witha pocket, l, tore- 4 ceive the spider when the latter is in eccentricposition, and havinga projection, J to which is hinged alever, J. Thecasing is also formed with a guide, I2, on the outside. The lever J hasa central pin, K, working in the grooves of the block, and a pin, L, atits extremity, connected to a slide, X, in the guide I2.

S is arock-shaft mounted transversely of the axle, to which are securedat nearly opposite sides the levers I and R. The lever T extends into arecess in the upper end of the slide E, to connect the slide and theshaft, by which the latter is adapted to operate the former. The otherllever, R, engages a stud, Q,

on aworm-wheel, P, mounted on a projection, I, on the casing.

V is a pitman connecting a crank, u, on the worm -wheel shaft with aslide, W', in the guide I, the latter slide and that, K, bearing againsteach other.

Beneath the guide I on the casing is a lug, m, and to this lug ispivoted by pintle n a toothed segment, O, engaged by the wormwheel P,and having a lever-arm, n.

n is the brake-chain, secured through eye n by thumb-nut n to thelever-arm.

a5 is a cord by which the tension of the chain is adjusted.

From the condition of rest the parts are operated as follows: The shaftS being rocked toward the wheel, the lever T will lower the slide E, theprojection E bearing on the collar F, the projections E2 and E3 on thebearings Dl and DT, respectively, and the projections E'* E bearing onthe flanged collar, the sleeve C will be retracted and the block Dadvanced, compressing the spring S, as shown in Fig. 2, and causing thespider to assume the eccentric position shown. In the meantime the firstrevolution of the block D carries vibrating lever across by causing thepin K to enter one or other of the inclined grooves. The upper end ofthe lever moves the slides X W', pitman V, crank u, wormwheel l?, andsector O, causing the arm of the sector to tighten the brake-chain. Thespider being caused to assume an eccentric position, the T-shaped armsthus projected occupy a position shown in Fig. 4, the head of an armlocking with one of the projections a on the disk A. By moving therock-shaft S in the opposite direction the lever R will strike the studQ on the worm-wheel and return the latter, its connections, andbrake-chain to normal condition, while the other lever, T, beingelevated at the same time, will lift the slide E and permit the sleeve,block, spider, and vibrating lever to be returned to normal condition bythe release of spring S.

It is evident that the brake will operate without the sleeve or spring,as it will be seen that when the lock is removed from the back of theblock the spider forces the said block laterally, causing it to regainits normal position, and so'retains it.

Having thus described our invention, the following is what we claim asnew therein and desire to secure by Letters Patent:

l. The combination, with a Wheel and an axle, of a sliding block, D D',a slide, E, a spider, B, and a disk, A, substantially as set forth.

2. The combination, with a wheel and an axle, of a sleeve, C, a slidingblock, D D', a slide, E, a spider, B, a disk, A, and a spring betweenthe sleeve and theblock, substantially as set forth.

3. lThe combination of a wheel, an axle, a disk having a concave face,and projections forming recesses, a spider fitting the concave face andhaving arms occupying the recesses in the disk, a sleeve having aconical head working in the spider, a sliding block on the sleeve, aslide to advance the block and retract the sleeve, and a spring toretract the block and advance the sleeve, substantially as set forth.

4. The combination of the disk, spider, sleeve, block, spring, flangedcollar, fixed collar, and slide E, having projections E E2 E"s E5 E5,substantially as set forth.

5. The combination of the disk, spider, sleeve, slide, spring, aslidingblock formed with inclined face bearing on the spider,yandgrooves D2 D D3 D5, and a vibrating lejver, J', having a pin, K,occupying thc grooves, substantially as set forth.

6. The combination of the disk, spider, block, spring, slide, androck-shaft having lev ver for lowering and lifting the slide,substantially as set fort-h.

7. The combination of the vibrating lever J, slides X and W', pitman V,crank u, wormwheel I), sector O, having an arm, a, and brakechain,substantially as set forth.

8. The combination of the rock-shaft S, having lever R, the worm-whee1l?, having stud Q, sector O, having leverarm n, anda brakechain,substantially as set forth.

JAMES J. HARKINS. JOHN H ARK INS.

Witnesses:

CALEB C. LEE, C. W. Ross.

